Charles a



(No Model.)

C. A. HALE.

ELEGTEIG ALARM BELL.

No. 462,381. Patented Nov. 3, 1891.

|||||||||| i l| I IllIlulnlmlillllllllI UNITED STATES PATENT OFFICE.

CHARLES A. HALE, OE CLEVELAND, OHIO, ASSIGNOR TO THE TIME ELECTRIC COMPANY, OF SAME PLACE.

ELECTRIC ALARM-BELL.

SPECIFICATION forming part of Letters Patent No. 462,381, dated November 3, 1891.

Application filed Tune 5, 189].. Serial No. 395,182. (No model.)

To all whom it may concern:

Be it known that I, CHARLES A. HALE, a citirzen of the United States, and a resident of Cleveland, county of Cuyahoga, and State of Ohio, have invented certain new and useful Improvements in Electric Alarm Bells, of which the following is a specification, the principle of the invention being herein explained and the best mode in which I have xo contemplated applying that principle so as to distinguish it from other inventions.

The objects of my invention are to provide an improved electric alarm-bell in which the core, pole-pieces, and supporting-base are 15 formed from one integral piece of soft iron,

and to provideimproved means for operating such a bell.

The annexed drawings and the following` description set forth in detail one mechanizo cal form embodying the invention, such detail construction being butone of various mechanical forms in which the principle of the invention may be used.

In said annexed drawings, Figure I repre- Fig. II, a rear View of the same; and Fig. III a front view of the base, pole-pieces, and core with the coil, bell, armature, and bindingposts removed.

In the drawings, the letter'A indicates the upper end of the base portion of the bell, which portion is cast or otherwise formed from soft iron integral with the magnet-core A', upper and lower pole-pieces A2 and A3, and lower base portion A4. The base portions are preferably formed with flanges et and o. upon their rear faces and have lugs d2 and a3, by means of which they may be held a short distance away from the wall or other surface upon which the alarm-bell is supported. The upper base portion A is long and narrow and has an upper longitudinal slot a4 with parallel edges and a short lower slot a5, having its lower end enlarged so that it may be passed over the head of a nail or screw upon which the alarm is supported, the slot riding upon the nail or screw with its narrow upper portion.

The wires B and B of an open circuit are respectively secured in a bindngpost C in sents a front view of my improved alarm-be1l;'

contact with the lower base portion and a binding-post C insulated from the lower base portion, said binding-post being secured to the base portion by means of a binding-screw c, passing through a hole u. in the base portion and insulated from said hole by an insulating sleeve or collar c. One end d of a wire D, wound upon the core A', to form the coil or helix of an electro-magnet is secured and connected to the insulated binding-post 6o C by means of the binding-screw c, and the other end d of the wire is secured and connected to a contact-post E by means of a binding-screw e, which passes through an ear ai of the upper base portion A and is insulated from the same by an insulating sleeve or collar e. The free end portions of the wirecoil D are preferably covered with insulating sleeves e2 and e3 besides the usual silk or cotton covering. A contact-screw E', having a 7o contact-point c4 of platinum or similar nonoxdizable metal, is inserted through the contact-post E and may come in contact with a contact-point f of similar metal upon an automatic contact-breaker consisting of an armature F having a strip F of spring metal secured to its back and of a sufficient length to be attracted by both pole-pieces of the magnet. The lower end ot' the spring strip is bent inward and secured to a small bracket 8o as upon the under side of the lower pole-piece. The upper end of the spring strip is bent outward from the back of the armature to forni a spring f', upon the upper end of which the contact-point f is secured. A hammer F2 is 85 secured in the upper end of the armature and may strike a bell G when the contact-breaker is vibrated. Said bell is secured upon apost g, the inner end of which has a screw g inserted through the longitudinal slot of the 9o upper base portion and into the inner end of the post, said screw having preferably a washer g2 bearing against the edges of the slot.

When the binding-posts of the alarm are connected to an open circuit and said circuit is closed by a suitable push-button or other make-and-break device, the core, pole-pieces, and base will be magnetized and the armature will be attracted to the pole-pieces. This roo Will break the circuit, as the circuit passed through the contact-screw, armature, and lower base portion andthe contact-point upon the contact-breaker is Withdrawn from the contact-screw. When the circuit is broken the magnet is demagnetized and releases the armature, which again closes the circuit, and the armature and hammer may thus vibrate as the circuitis made and broken, ringing the' bell.

Bells of Various lsizes may be employed in a base as the post may be adjusted in the longitudinal slot of the upper base portion so as to be in proper position to be struck by the hammer.

The device may be made at a comparatively small expense, as the base-frame, core, and pole-pieces are cast or otherwise formed in one piece, being preferably cast.

The armature will be attracted by bot-h polepieces cf the electro-magnetV and the action of the bell will consequently be very effective while the structure for actuating it is very simple.

Other modes of applying the principle of my invention may be employed for the mode herein explained. Change may therefore be made as regards the mechanism herein set forth, providing the principles of construction respectively recited in the followingr claims are employed..

I therefore particularly point out and distinct-ly claim as my inventionl. A base-frame formed with means for attaching the circuit-Wires, and contact-post, magnet-core, and pole-pieces, all formed integral from one piece of metal, substantially as set forth.

2.' The combination, with abase-frame and be1l-support,a magnet-core and pole-pieces in alignment with each other and united by said core, and an ear for the contact-post, all formed integral from one piece of metal, 0f an electric wire-circuit coiled around the magnet-core, and an armature for said magnet, substantially as set forth. Y In testimony that I claim the foregoing to be my invention I have hereunto set my hand Vthis 22d day of May, A. D. 1891.

CHAS. A. HALF..

Vitnesses:

J. B. FAY, WM. SECHER. 

